If you see monk they either have very strong body and also very fast attack combo. If you want to be a monk you must ready to be either damage taker or damage dealer. Even monk use clothes as their armor, monk has very great defend skills. Monk usually role as tanker when MVP, Monk also could be super high damage dealer (in short time / every 60/120 second) with a skill combination. You will get skill reset when class change from acolyte to monk.

There are two type of monk Tanker and Damager

Tanker Skill and Stat Build
1 VIT and 1 AGI

Pro:
Very high defend from skills
Con:
Very low damage and need high concentration when fighing boss in dungeon

Damager Skill and Stat Build
Full STR and the rest for AGI/VIT (I reccomend AGI as your stats)

Pro:
Very high attack and wonderful combo
Con:
You need to wait every 60 second for guillotine fist